Reactivities of phosphaalkynes towards diverse bis-silylenes.

Bis-silylenes do not only act as strong chelating σ-donor ligands, but also exhibit cooperative behaviour in the activation of small molecules. Three different P-Si containing molecules were prepared from the reaction between t BuCP and different bis-silylenes, which are bridged by ferrocenediyl, diaminobenzene, or o -carborane.